CN103591064A - Landing leg control hydraulic system and engineering vehicle - Google Patents

Landing leg control hydraulic system and engineering vehicle Download PDF

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Publication number
CN103591064A
CN103591064A CN201310576530.6A CN201310576530A CN103591064A CN 103591064 A CN103591064 A CN 103591064A CN 201310576530 A CN201310576530 A CN 201310576530A CN 103591064 A CN103591064 A CN 103591064A
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China
Prior art keywords
oil
leg
oil circuit
valve
rodless cavity
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CN201310576530.6A
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CN103591064B (en
Inventor
熊炳榕
欧涛
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Hunan Zoomlion emergency equipment Co., Ltd
Zoomlion Heavy Industry Co., Ltd
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Zoomlion Heavy Industry Science and Technology Co Ltd
Changsha Zoomlion Fire Fighting Machinery Co Ltd
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Priority to CN201310576530.6A priority Critical patent/CN103591064B/en
Publication of CN103591064A publication Critical patent/CN103591064A/en
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Abstract

The invention discloses a landing leg control hydraulic system and an engineering vehicle. The landing leg control hydraulic system comprises a landing leg hydraulic cylinder (1), a landing leg reversing valve (6), a system oil inlet path (P) and a system oil return path (T), wherein the system oil inlet path (P) is connected to an oil inlet port (P1) of the landing leg reversing valve (6), and the system oil return path (T) is connected to an oil return port (T1) of the landing leg reversing valve (6); a first working oil port (A) of the landing leg reversing valve is connected to a rod cavity of the landing leg hydraulic cylinder through a rod cavity oil path (V1); a second working oil port (B) of the landing leg reversing valve is connected to a rodless cavity of the landing leg hydraulic cylinder through a rodless cavity oil path (V2). The landing leg control hydraulic system further comprises a weak leg oil supplementation path (V3) provided with an oil supplementation pump (2), wherein the oil supplementation pump (2) is in pressure connection with the rodless cavity oil path so as to pump hydraulic oil to the rodless cavity of the landing leg hydraulic cylinder. When a sensor detects a weak leg phenomenon, high pressure oil is supplemented by the weak leg oil supplementation path through the oil supplementation pump and pumped to a rodless cavity of a corresponding landing leg so as to push a piston rod to extend, as a result, all landing legs keep supported on the ground all the time, and the stability of the overall vehicle structure is improved.

Description

Supporting leg is controlled hydraulic system and engineering vehicle
Technical field
The present invention relates to a kind of supporting leg of engineering vehicle, especially a kind of control hydraulic system of supporting leg.
Background technique
In the lower truck system of engineering vehicle, conventionally have four supporting legs, the boom system of getting on the bus is connected with chassis by subframe.During the jib of getting on the bus work, generally need four supporting legs to land stressed simultaneously, with stress equalization, make complete vehicle structure stable.But when the work range of the jib of getting on the bus reaches certain value, subframe can produce deformation owing to being subject to very strong moment of torsion, cause under certain work orientation state, one of them vertical leg can not stress because of deformation, produces empty leg phenomenon.When there is this empty leg phenomenon, can cause very big impact to the stability of car load, when serious, even can cause slide-out, cause security incident.
In view of this, need to control hydraulic system to supporting leg and improve, the respective leg elongation that produces empty leg phenomenon is landed, make complete vehicle structure more stable.
Summary of the invention
The object of this invention is to provide a kind of supporting leg and control hydraulic system and there is the engineering vehicle that this supporting leg is controlled hydraulic system, can effectively solve the empty leg phenomenon of supporting leg, make complete vehicle structure more stable.
For achieving the above object, the invention provides a kind of supporting leg and control hydraulic system, this system comprises landing leg hydraulic cylinder, supporting leg selector valve and the oil-feed hydraulic fluid port and the system oil-feed oil circuit on oil return hydraulic fluid port and the system oil return oil circuit that are connected respectively to this supporting leg selector valve, the first actuator port of described supporting leg selector valve is connected to the rod chamber of described landing leg hydraulic cylinder by rod chamber oil circuit, the second actuator port is connected to the rodless cavity of described landing leg hydraulic cylinder by rodless cavity oil circuit, wherein, this system also comprises the empty leg repairing oil circuit that is provided with slippage pump, this void leg repairing oil circuit hydraulic connecting is in described rodless cavity oil circuit, described slippage pump can detect under the operating mode of empty leg by described empty leg repairing oil circuit to the rodless cavity pumps hydraulic oil that produces the described landing leg hydraulic cylinder of empty leg.
Preferably, in described empty leg repairing oil circuit, be provided with repairing one-way valve.
Preferably, this system also comprises repairing oil return circuit and the first solenoid valve, this repairing oil return circuit is connected between described empty leg repairing oil circuit and described system oil return case, and described the first solenoid valve is arranged in described repairing oil return circuit to control conducting or to end this repairing oil return circuit.
Preferably, this system also comprises relief valve, being connected in oil circuit between the oil outlet that this relief valve is arranged on described slippage pump and system oil return case.
Preferably, in described rodless cavity oil circuit, be provided with Pilot operated check valve, the reverse port hydraulic connecting of this Pilot operated check valve is in the rodless cavity of described landing leg hydraulic cylinder, and the oil circuit control hydraulic connecting of this Pilot operated check valve is to described rod chamber oil circuit.
Preferably, this system also comprises internal control type equilibrium valve, this internal control type equilibrium valve is connected with described Pilot operated check valve and is arranged in described rodless cavity oil circuit, the arranged direction of the positive and negative port of the one-way valve in described internal control type equilibrium valve is consistent with described Pilot operated check valve, and described empty leg repairing oil circuit is connected on the described internal control type equilibrium valve and the part oil circuit between described Pilot operated check valve in described rodless cavity oil circuit.
Preferably, this system also comprises the second solenoid valve, and this second solenoid valve and described internal control type equilibrium valve are arranged in parallel in described rodless cavity oil circuit.
Preferably, in described rod chamber oil circuit, be provided with externally controlled type equilibrium valve, the oil circuit control hydraulic connecting of this externally controlled type equilibrium valve is to described rodless cavity oil circuit.
Preferably, this system comprise a plurality of described landing leg hydraulic cylinders and with each landing leg hydraulic cylinder supporting leg selector valve one to one, described empty leg repairing oil circuit is connected to respectively in the described rodless cavity oil circuit of landing leg hydraulic cylinder described in each.
On the basis of the above, the present invention also provides a kind of engineering vehicle, and this project vehicle comprises the supporting leg control hydraulic system above-mentioned according to the present invention.
Preferably, this project vehicle also comprises controller and empty leg detecting sensor, described controller is electrically connected to the drive motor of described empty leg detecting sensor and described slippage pump respectively, to control and to start described drive motor, thereby drive described slippage pump work when described empty leg detecting sensor detects the empty leg phenomenon of supporting leg.
According to technique scheme, supporting leg of the present invention is controlled in hydraulic system and is provided with especially the empty leg repairing oil circuit being connected on rodless cavity oil circuit, when sensor detects empty leg phenomenon generation, this void leg repairing oil circuit supplements high pressure oil by slippage pump to rodless cavity oil circuit, by rodless cavity oil circuit, be pumped in the rodless cavity of the respective leg that produces empty leg, the piston rod that promotes this supporting leg further extends, the supporting leg support that lands, thereby each supporting leg that can control engineering vehicle remains at ground holding state, and complete vehicle structure reliability improves.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Accompanying drawing explanation
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the hydraulic schematic diagram that the supporting leg of a preferred embodiment of the invention is controlled hydraulic system;
Fig. 2 controls the hydraulic schematic diagram of hydraulic system according to the supporting leg of another kind of preferred implementation of the present invention;
Fig. 3 controls hydraulic system according to the supporting leg in engineering vehicle of the present invention, has adopted the system shown in Fig. 2 and empty leg repairing oil circuit to be connected on the rodless cavity of a plurality of supporting legs in this vehicle; And
Fig. 4 controls the control flow chart of hydraulic system according to supporting leg of the present invention.
Description of reference numerals
1 landing leg hydraulic cylinder 2 slippage pumps
3 repairing one-way valve 4 second solenoid valves
5 internal control type equilibrium valve 6 supporting leg selector valves
7 externally controlled type equilibrium valve 8 Pilot operated check valves
9 first solenoid valve 10 relief valves
P system oil-feed oil circuit T system oil return oil circuit
A first actuator port B the second actuator port
P1 oil-feed hydraulic fluid port T1 oil return hydraulic fluid port
V1 rod chamber oil circuit V2 rodless cavity oil circuit
The empty leg repairing of V3 oil circuit V4 repairing oil return circuit
M drive motor
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
In the present invention, in the situation that not doing contrary explanation, the noun of locality using is if " upper and lower " is normally for direction shown in the drawings, or for each parts mutual alignment relationship description word vertically, on vertical or gravitational direction, or for the car load short transverse of engineering vehicle.
As shown in Figure 1, the invention provides a kind of supporting leg and control hydraulic system, this system comprises landing leg hydraulic cylinder 1, supporting leg selector valve 6 and the oil-feed hydraulic fluid port P1 and the system oil-feed oil circuit P on oil return hydraulic fluid port T1 and the system oil return oil circuit T that are connected respectively to this supporting leg selector valve 6, the first actuator port A of supporting leg selector valve 6 is connected to the rod chamber of landing leg hydraulic cylinder 1 by rod chamber oil circuit V1, the second actuator port B is connected to the rodless cavity of landing leg hydraulic cylinder 1 by rodless cavity oil circuit V2, wherein, this hydraulic system also comprises the empty leg repairing oil circuit V3 that is provided with slippage pump 2, this void leg repairing oil circuit V3 hydraulic connecting is in rodless cavity oil circuit V2, with can be to the rodless cavity pumps hydraulic oil of landing leg hydraulic cylinder 1.As total inventive concept, herein by setting up empty leg repairing oil circuit V3 to carry out repairing to producing the rodless cavity of the supporting leg of empty leg, make it elongation and land, obtain stable support, thereby effectively solve the empty leg phenomenon of supporting leg, improve the stability of car load.
Wherein, referring to Fig. 1, supporting leg selector valve 6 is preferably the solenoid directional control valve of 3-position 4-way.Hydraulic oil in system oil-feed oil circuit P enters the oil-feed hydraulic fluid port P1 of supporting leg selector valve 6, by the switching controls of this supporting leg selector valve 6, when oil-feed hydraulic fluid port P1 is communicated with the second actuator port B, oil return hydraulic fluid port T1 and is communicated with the first actuator port A, hydraulic oil is communicated to the rodless cavity of landing leg hydraulic cylinder 1 by rodless cavity oil circuit V2 through the second actuator port B, hydraulic oil enters rodless cavity promotion cylinder piston rod and stretches out.Or when oil-feed hydraulic fluid port P1 is communicated with the first actuator port A, oil return hydraulic fluid port T1 and is communicated with the second actuator port B, hydraulic oil is connected to the rod chamber of landing leg hydraulic cylinder 1 by rod chamber oil circuit V1 through the first actuator port A, promote piston rod retraction.
Therefore, when solving the empty leg problem of supporting leg, empty leg repairing oil circuit V3 can be connected to rodless cavity oil circuit V2, make hydraulic oil enter rodless cavity promotion piston rod and stretch out.But, should prevent that the rodless cavity of landing leg hydraulic cylinder 1 and the hydraulic oil in rodless cavity oil circuit V2 from flowing backwards covering oil pump 2 and slippage pump 2 is impacted, thereby in empty leg repairing oil circuit V3, be provided preferably with repairing one-way valve 3 as shown in Figure 1, to protect slippage pump 2.
In addition, in this system, also preferably include the oil outlet of hydraulic connecting slippage pump 2 and the repairing oil return circuit V4 of system oil return case, so that the hydraulic oil in empty leg repairing oil circuit V3 can be via repairing oil return circuit V4 toward system oil return tank drainback.Wherein, in this repairing oil return circuit V4, be provided preferably with relief valve 10, play the safety effect to whole system, make the pressure maximum of hydraulic oil at the oil outlet place of slippage pump 2 be no more than the pressure set points of this relief valve 10.And, this system also preferably includes the first solenoid valve 9, this first solenoid valve 9 and relief valve 10 are arranged in parallel in repairing oil return circuit V4, and oil inlet end separately respectively hydraulic connecting on repairing one-way valve 3 and the oil circuit part between the oil outlet of slippage pump 2 in empty leg repairing oil circuit V3.As shown in Figure 3, the first solenoid valve 9 is preferably two position two-way valve, and electromagnet obtains oil circuit cut-off when electric, oil circuit conducting during dead electricity.Therefore, after system repairing finishes, when slippage pump 2 quits work, owing to still having pressure in empty leg repairing oil circuit V3, now control the electromagnet dead electricity of the first solenoid valve 9, thereby the pressure in empty leg repairing oil circuit V3 is laid down, residue fluid is by the direct oil sump tank of repairing oil return circuit V4.
Get back to rod chamber oil circuit V1 and the rodless cavity oil circuit V2 of landing leg hydraulic cylinder 1, wherein, in rodless cavity oil circuit V2, be provided preferably with Pilot operated check valve 8, the reverse port hydraulic connecting of this Pilot operated check valve 8 is in the rodless cavity of landing leg hydraulic cylinder 1, and the oil circuit control hydraulic connecting of this Pilot operated check valve 8 is to rod chamber oil circuit V1.Like this, when system oil-feed oil circuit P is communicated with rodless cavity oil circuit V2, the hydraulic oil Pilot operated check valve 8 of can flowing through smoothly flows to rodless cavity, and now the hydraulic oil in rod chamber is through rod chamber oil circuit V1 oil return.When system oil-feed oil circuit P is communicated with rod chamber oil circuit V1, high pressure liquid force feed enters rod chamber by rod chamber oil circuit V1, and through the oil circuit control of Pilot operated check valve 8, open this Pilot operated check valve 8 simultaneously, make Pilot operated check valve 8 oil returns of can flowing through smoothly of hydraulic oil in rodless cavity.When position is ended in the centre of supporting leg selector valve 6 in Fig. 1, the hydraulic fluid pressure in rod chamber oil circuit V1 and rodless cavity oil circuit V2 is suitable, and Pilot operated check valve 8 can not reverse opening.Hydraulic oil in rodless cavity can not be refluxed by rodless cavity oil circuit V2 by locking, and the piston rod of landing leg hydraulic cylinder 1 remains on existing position, prevents landing voluntarily.
And this system also preferably includes internal control type equilibrium valve 5 and the second solenoid valve 4,, the second solenoid valve 4, for when the work of system dependence main oil pump is also passed through the second solenoid valve 4 oil return, reduces return pressure, and the heating value of system is reduced.Internal control type equilibrium valve 5 is used in slippage pump 2 while the rodless cavity of landing leg hydraulic cylinder 1 being carried out to repairing by empty leg repairing oil circuit V3 and rodless cavity oil circuit V2, prevents that the pressure of the repairing fluid in rodless cavity oil circuit V2 is excessive.The excessive repairing fluid of pressure can be by the relief valve overflow in this internal control type equilibrium valve 5, and overflowing liquid force feed is by the oil return hydraulic fluid port T1 oil return of supporting leg selector valve 6.This internal control type equilibrium valve 5 is connected with Pilot operated check valve 8 and is arranged in rodless cavity oil circuit V2, the arranged direction of the positive and negative port of the one-way valve in Pilot operated check valve 8 is consistent with Pilot operated check valve 8, and empty leg repairing oil circuit V3 hydraulic pressure is preferably connected on the internal control type equilibrium valve 5 and the part oil circuit between Pilot operated check valve 8 in rodless cavity oil circuit V2.This second solenoid valve 4 and internal control type equilibrium valve 5 are arranged in parallel in rodless cavity oil circuit V2.The structure of the second solenoid valve 4 is identical with the first solenoid valve 9, is preferably two position two-way valve, the same hydraulic oil oil return for rodless cavity oil circuit V2.In addition, in rod chamber oil circuit V1, be provided preferably with equally externally controlled type equilibrium valve 7, the effect of this externally controlled type equilibrium valve 7 is identical with internal control type equilibrium valve 5, and its oil circuit control hydraulic connecting is to rodless cavity oil circuit V2.
Like this, when the lower truck system normal operation of engineering vehicle launches supporting leg: supporting leg selector valve 6 electric the next in Fig. 1, the second solenoid valve 4 obtains electric in the next, now oil-feed hydraulic fluid port P1 is communicated with the second actuator port B, oil return hydraulic fluid port T1 is communicated with the first actuator port A, hydraulic oil enters the rodless cavity of oil cylinder from the second actuator port B by internal control type equilibrium valve 5 and Pilot operated check valve 8, oil cylinder stretches out, meanwhile, the hydraulic oil of rod chamber flows to the first actuator port A to oil return hydraulic fluid port T1 by externally controlled type equilibrium valve 7.
When supporting leg is reclaimed in truck system normal operation instantly: supporting leg selector valve 6 obtains electric in upper, the second solenoid valve 4 dead electricity, under the effect of spring force in upper and conducting rodless cavity oil circuit V2, now, oil-feed hydraulic fluid port P1 is communicated with the first actuator port A, oil return hydraulic fluid port T1 is communicated with the second actuator port B, now hydraulic oil enters the rod chamber of oil cylinder from the first actuator port A by externally controlled type equilibrium valve 7, oil cylinder retraction, hydraulic oil in rod chamber is locked by Pilot operated check valve 8 simultaneously, hydraulic oil in rodless cavity oil circuit V2 is flowed through the second actuator port B to oil return hydraulic fluid port T1, by system oil return oil circuit, T is back to system oil return case.
In addition, as shown in Figure 2, also provide another embodiment of controlling hydraulic system according to supporting leg of the present invention, this system has lacked the first solenoid valve 9 and the second solenoid valve 4 for system shown in Figure 1, but also can substantially realize object of the present invention.Wherein, when truck system normal operation instantly launches supporting leg or normal operation recovery supporting leg, the system of working procedure and Fig. 1 is roughly the same.Different is, when reclaiming supporting leg, hydraulic oil in rodless cavity is flowed through the second actuator port B to oil return hydraulic fluid port T1 by Pilot operated check valve 8 and internal control type equilibrium valve 5, now due to the existence of the oil pressure relief in internal control type equilibrium valve 5, make the return oil pressure of system very large, cause system to have the energy of major part all for heating.
With upper supporting leg, controlling on the basis of hydraulic system, the present invention also provides a kind of engineering vehicle that above-mentioned supporting leg is controlled hydraulic system that has.Wherein, this system comprise a plurality of landing leg hydraulic cylinders 1 and with each landing leg hydraulic cylinder 1 supporting leg selector valve 6 one to one, empty leg repairing oil circuit V3 is connected to respectively in the rodless cavity oil circuit V2 of each landing leg hydraulic cylinder 1.As shown in Figure 3, in this project vehicle, there are a plurality of landing leg hydraulic cylinders, but only need the empty leg repairing of wall scroll oil circuit V3, be connected in the rodless cavity oil circuit V2 of each leg oil hydraulic cylinder 1.When certain supporting leg produces empty leg, can be by empty leg repairing oil circuit V3 repairing.
In addition, this project vehicle also preferably includes controller and empty leg detecting sensor, controller is electrically connected to the drive motor M of empty leg detecting sensor and slippage pump 2 respectively, to control, start drive motor M when empty leg detecting sensor detects the empty leg phenomenon of supporting leg, thereby drive slippage pump 2 work.
Shown in Fig. 4 and Fig. 1, similarly, when system is detected one of them supporting leg and is produced empty leg by empty leg detecting sensor, start oil-supplementing system, drive motor M, the second solenoid valve 4 and the first solenoid valve 9 obtain electric, and drive motor M starts to drive slippage pump 2 work, and the second solenoid valve 4 and the first solenoid valve 9 obtain electric closing, slippage pump 2 hydraulic oil out arrives the rodless cavity of oil cylinder through repairing one-way valve 3 and Pilot operated check valve 8, thereby oil cylinder stretches out.Now, relief valve in system 10 plays safety protection effect with internal control type equilibrium valve 5, prevents overpressure and causes tumbling of vehicle body, and the setting pressure of internal control type equilibrium valve 5 is lower than relief valve 10 simultaneously.When sensor detects empty leg signal relief, the second solenoid valve 4 and the first solenoid valve 9 dead electricity, under the effect of spring force, in normal position, the hydraulic oil in empty leg repairing oil circuit V3 is through the first solenoid valve 9 by repairing oil return circuit V4 oil return, and the pressure in other each oil circuit is also laid down.While drive motor M dead electricity, system quits work.Thereby it is stressed that supporting leg that makes empty leg lands again, and boom system can work on, solved rapidly empty leg problem.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible compound modes.
In addition, between various mode of execution of the present invention, also can carry out combination in any, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.

Claims (11)

1. a supporting leg is controlled hydraulic system, this system comprises landing leg hydraulic cylinder (1), supporting leg selector valve (6) and the oil-feed hydraulic fluid port (P1) and the system oil-feed oil circuit (P) on oil return hydraulic fluid port (T1) and the system oil return oil circuit (T) that are connected respectively to this supporting leg selector valve (6), first actuator port (A) of described supporting leg selector valve (6) is connected to the rod chamber of described landing leg hydraulic cylinder (1) by rod chamber oil circuit (V1), the second actuator port (B) is connected to the rodless cavity of described landing leg hydraulic cylinder (1) by rodless cavity oil circuit (V2), it is characterized in that, this system also comprises the empty leg repairing oil circuit (V3) that is provided with slippage pump (2), this void leg repairing oil circuit (V3) is connected in described rodless cavity oil circuit (V2), described slippage pump (2) can detect under the operating mode of empty leg by described empty leg repairing oil circuit (V3) to the rodless cavity pumps hydraulic oil that produces the described landing leg hydraulic cylinder (1) of empty leg.
2. supporting leg according to claim 1 is controlled hydraulic system, it is characterized in that, is provided with repairing one-way valve (3) in described empty leg repairing oil circuit (V3).
3. supporting leg according to claim 2 is controlled hydraulic system, it is characterized in that, this system also comprises repairing oil return circuit (V4) and the first solenoid valve (9), this repairing oil return circuit (V4) is connected between described empty leg repairing oil circuit (V3) and described system oil return case, and described the first solenoid valve (9) is arranged in described repairing oil return circuit (V4) to control conducting or to end this repairing oil return circuit (V4).
4. supporting leg according to claim 3 is controlled hydraulic system, it is characterized in that, this system also comprises relief valve (10), being connected in oil circuit between the oil outlet that this relief valve (10) is arranged on described slippage pump (2) and system oil return case.
5. supporting leg according to claim 1 is controlled hydraulic system, it is characterized in that, in described rodless cavity oil circuit (V2), be provided with Pilot operated check valve (8), the reverse port hydraulic connecting of this Pilot operated check valve (8) is in the rodless cavity of described landing leg hydraulic cylinder (1), and the oil circuit control hydraulic connecting of this Pilot operated check valve (8) is to described rod chamber oil circuit (V1).
6. supporting leg according to claim 5 is controlled hydraulic system, it is characterized in that, this system also comprises internal control type equilibrium valve (5), this internal control type equilibrium valve (5) is connected and is arranged in described rodless cavity oil circuit (V2) with described Pilot operated check valve (8), the arranged direction of the positive and negative port of the one-way valve in described internal control type equilibrium valve (5) is consistent with described Pilot operated check valve (8), and described empty leg repairing oil circuit (V3) is connected on the described internal control type equilibrium valve (5) and the part oil circuit between described Pilot operated check valve (8) in described rodless cavity oil circuit (V2).
7. supporting leg according to claim 6 is controlled hydraulic system, it is characterized in that, this system also comprises the second solenoid valve (4), and this second solenoid valve (4) and described internal control type equilibrium valve (5) are arranged in parallel in described rodless cavity oil circuit (V2).
8. supporting leg according to claim 1 is controlled hydraulic system, it is characterized in that, is provided with externally controlled type equilibrium valve (7) in described rod chamber oil circuit (V1), and the oil circuit control hydraulic connecting of this externally controlled type equilibrium valve (7) is to described rodless cavity oil circuit (V2).
9. supporting leg according to claim 1 is controlled hydraulic system, it is characterized in that, this system comprise a plurality of described landing leg hydraulic cylinders (1) and with each landing leg hydraulic cylinder (1) supporting leg selector valve (6) one to one, described empty leg repairing oil circuit (V3) is connected to respectively in the described rodless cavity oil circuit (V2) of landing leg hydraulic cylinder (1) described in each.
10. an engineering vehicle, is characterized in that, this project vehicle comprises according to the supporting leg described in any one in claim 1-9 controls hydraulic system.
11. engineering vehicles according to claim 10, it is characterized in that, this project vehicle also comprises controller and empty leg detecting sensor, described controller is electrically connected to the drive motor (M) of described empty leg detecting sensor and described slippage pump (2) respectively, to control and to start described drive motor (M), thereby drive described slippage pump (2) work when described empty leg detecting sensor detects the empty leg phenomenon of supporting leg.
CN201310576530.6A 2013-11-18 2013-11-18 Supporting leg hydraulic control system and engineering vehicle Active CN103591064B (en)

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CN103950434A (en) * 2014-03-25 2014-07-30 北京航天发射技术研究所 Device and method of judging ground contact support of high-adaptability support leg
CN103982411A (en) * 2014-05-20 2014-08-13 徐州徐工施维英机械有限公司 Cylinder locking method and device, and concrete pump
CN105035041A (en) * 2015-09-10 2015-11-11 徐工集团工程机械股份有限公司科技分公司 Engineering truck support leg electrohydraulic control system, method, detection method and engineering truck
CN109573840A (en) * 2017-09-29 2019-04-05 中国铁路总公司 A kind of crane and its leg control system

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CN103950434A (en) * 2014-03-25 2014-07-30 北京航天发射技术研究所 Device and method of judging ground contact support of high-adaptability support leg
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CN103982411A (en) * 2014-05-20 2014-08-13 徐州徐工施维英机械有限公司 Cylinder locking method and device, and concrete pump
CN103982411B (en) * 2014-05-20 2016-08-24 徐州徐工施维英机械有限公司 Lock cylinder method and apparatus and concrete pump
CN105035041A (en) * 2015-09-10 2015-11-11 徐工集团工程机械股份有限公司科技分公司 Engineering truck support leg electrohydraulic control system, method, detection method and engineering truck
CN105035041B (en) * 2015-09-10 2017-06-06 徐工集团工程机械股份有限公司科技分公司 The electrohydraulic control system of engineering vehicle's supporting legs, method, detection method and engineering truck
CN109573840A (en) * 2017-09-29 2019-04-05 中国铁路总公司 A kind of crane and its leg control system

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Address after: 410200 No. 997, Section 2, Tengfei Road, Wangcheng District, Changsha City, Hunan Province

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